There have been plenty of top managers over the years who weren't household names as players. They built their reputation in management from getting results with the players at their disposal.
If Unsworth can get the players that he has working together and firing, the results will come. That, in turn will attract some attention and others will want to come and join the project.
You don't necessarily need to have been a world class player to be a great coach/manager. It's a completely different skill set. Who did Mourinho play for, or Wenger? Their lack of a great playing career has never stopped them attracting quality players.